My laptop has Windows XP on it, and when I turned it on last time I had the infamous BSoD. It said something like "critical system error" or something along those lines. I turned it off, then back on and hit F5 then F8. and tried startup in every mode offered with the same results ever time, which is that it gets to the XP welcome screen and just stays on that screen. The progress bar under the logo runs across like it would if it was working, but nothing ever happen. How can I fix this?